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Vulnerability record · CVE-2020-8595 · published 12 February 2020

CVE-2020-8595: Istio improper authentication vulnerability

Istio · Istio

Istio versions 1.2.10 (End of Life) and prior, 1.3 through 1.3.7, and 1.4 through 1.4.3 allows authentication bypass. The Authentication Policy exact-path matching logic can allow unauthorized access to HTTP paths even if they are configured to be only accessed after presenting a valid JWT token. For example, an attacker can add a ? or # character to a URI that would otherwise satisfy an exact-path match.

7.3 CVSS 3.1 High EPSS 2.6% · top 15.1% CWE-287 · Improper authentication
7.3CVSS 3.1 base score, v2 7.5
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

Istio versions 1.2.10 (End of Life) and prior, 1.3 through 1.3.7, and 1.4 through 1.4.3 allows authentication bypass. The Authentication Policy exact-path matching logic can allow unauthorized access to HTTP paths even if they are configured to be only accessed after presenting a valid JWT token. For example, an attacker can add a ? or # character to a URI that would otherwise satisfy an exact-path match.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2020:0477 Third Party Advisory
https://access.redhat.com/security/cve/cve-2020-8595 MitigationThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-8595 Issue TrackingMitigationThird Party Advisory
https://github.com/istio/istio/commits/master Patch
https://istio.io/news/security/ Vendor Advisory
https://istio.io/news/security/istio-security-2020-001/ PatchVendor Advisory
https://access.redhat.com/errata/RHSA-2020:0477 Third Party Advisory
https://access.redhat.com/security/cve/cve-2020-8595 MitigationThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-8595 Issue TrackingMitigationThird Party Advisory
https://github.com/istio/istio/commits/master Patch
https://istio.io/news/security/ Vendor Advisory
https://istio.io/news/security/istio-security-2020-001/ PatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-8595), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.